I just stumbled across some IDE's I never even knew about:
http://arcadia.rubyforge.org/http://http://www.cloud-ide.com/http://shiftedit.net/home
I know that there are others out there, but these are what I found
first. What's remarkable here is the install process for these IDE's is
quite different from what I'm (somewhat) familiar with: Netbeans and
Eclipse.
These IDE's are distributed either by gem or through the browser. Quite
interesting.
-Thufir